Electro mechanical audio tone generator



July 30, 1963 R. E. WELCH 3,099,713

ELECTRO MECHANICAL AUDIO TONE GENERATOR Filed Feb. 27, 1961 2 Sheets-Sheet 1 22 INVENTOR.

4 41 aura July 30, 1963 R. E. WELCH 3,099, 13

ELECTRO MECHANICAL AUDIO TONE GENERATOR Filed Feb. 2'7, 1961 2 Sheets-Sheet 2 V Z0 3 36 9a A IK .I

IN V EN TOR.

United States Patent 3,099,713 ELECTRO MECHANICAL AUDIO TONE GENERATOR Ruel E. Welch, Salem, Oreg. (P.O. Box 22, Holt, Mich.) Filed Feb. 27, 1961, Ser. No. 91,700 3 Claims. (Cl. 1792) This invention relates to wave generators and more particularly to an electro-mechanical audio tone square wave generator.

It is an object of the present invention to provide an electro-mechanical audio tone square wave generator which can be effectively used as an alarm system, electromechanical switch matrix, or the like for a variety of different purposes.

Still another object of the persent invention is to provide a square wave generator which can be connected in combination with two or more similar devices in parallel, and operated at different voltages and phasing to obtain a wider pulse or a step up and step down wave shape.

Still an additional object of the present invention is to provide an electro-mechanical audio tone square wave generator of the above type which can be used for teaching code, is readily portable, and which can be used with a variety of different dry cell arrangements.

Other objects of the invention are to provide an electromechanical audio tone square wave generator bearing the above objects in mind which is of simple construction, has a minimum number of parts, is inexpensive to manufact-ure and eflicient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in conjunction with the accompanying drawing, in which:

FIGURE 1 is a perspective view of an electro-mechanical audio tone square wave generator made in accordance with the present invention;

FIGURE 2 is a front view of a speaker switch forming a part of the present invention; and

FIGURE 3 is a schematic wiring diagram of the present invention.

Referring now more in detail to the drawing, an electromechanical audio tone square wave generator '10 made in accordance with the present invention is shown to include a housing 12 having a hand microphone 14 mounted upon the front thereof, adjacent to a plurality of apertures 15 through which sound may emanate from a permanent magnet speaker 34 mounted therebehind. The front panel also includes a pair of phone-plug jacks 16 for connecting the microphone 14 thereto, as well as a pair of similar jacks 18 for connection to a line.

A selector switch 20 mounted upon the front panel of the housing -12 controls the position of an eccentric 22 mounted within the interior of the housing, to adjust the position of a lever 24 pivotally secured upon a hinge pin 26 within the housing. This lever 24 supports a cont-act 28 which is rotatable with respect to a cooperating contact 30 secured upon the core 32 of the speaker 34 so as to control the position of a pair of switch elements 28 which effect the tone of the speaker 34 during use.

The speaker tone switch elements 28 are connected in circuit with dry cells 36, which circuit may be energized by the closing of an auxiliary switch 19, within which circuit a code key 38 may be connected across terminals 40 connected to jacks 40 opening upon the front panel of the main housing 12.

It will now be recognized that by adjusting the position of the lever 24 through rotation of the switch knob 20, the tone of the speaker can be varied to accommodate substantially any type of signal desired. Thus, the present invention is applicable to a wide variety of uses, all in a simple and convenient manner. Another important feature of the present invention is that it is extremely compact, operates on a minimum amount of power, and can be used in combination in parallel and operated in different voltages and phasing to obtain a wide pulse, or for stepping up or stepping down a particular wave shape.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What I claim as new and desire to protect by Letters Patent of the United States is:

1. An electro mechanical audio tone square wave generator comprising in combination a permanent magnet speaker, an input terminal for said speaker, a variable tone influencing assembly, switch means adjusting the connection of said tone influencing assembly, said permanent magnet speaker including a core and said variable tone influencing assembly acting upon said core of said speaker, said input terminal comprising a variety of microphone line and code key plug receiving jacks, all of said jacks being connected in parallel circuit relationship with said variable tone influencing assemblies, said variable tone influencing assembly comprising a plurality of switch elements acting in conjunction with said core of said speaker and a housing completely enclosing said speaker and said variable tone influencing assembly.

2. The combination according to claim 1, wherein said jacks for modulating said input comprise said jacks of said electrical signal input for modulating the input to said speaker.

3. The combination according to claim 2, wherein said switch means comprises a lever pivotally mounted within said housing, an eccentric rotatably mounted upon said housing acting upon one end of said lever, and the opposite end of said lever including contact elements engageable with corresponding contact elements mounted upon said core of said speaker.

References Cited in the file of this patent UNITED STATES PATENTS 2,047,863 Finch July 14, 1936 2,159,632 Morey May 23, 1939 2,359,294 =Blenman Oct. 3, 1944 2,988,599 Ieanmonad et al. June 13, 1961 FOREIGN PATENTS 218,534 Switzerland Oct. 16, 1942 587,447 Great Britain Apr. 25, 1947 

1. AN ELECTRO MECHANICAL AUDIO TONE SQUARE WAVE GENERATOR COMPRISING IN COMBINATION A PERMANENT MAGNET SPEAKER, AN INPUT TERMINAL FOR SAID SPEAKER, A VARIABLE TONE INFLUENCING ASSEMBLY, SWITCH MEANS ADJUSTING THE CONNECTION OF SAID TONE INFLUENCING ASSEMBLY, SAID PERMANENT MAGNET SPEAKER INCLUDING A CORE AND SAID VARIABLE TONE INFLUENCING ASSEMBLY ACTING UPON SAID CORE OF SAID SPEAKER, SAID INPUT TERMINAL COMPRISING A VARIETY OF MICROPHONE LINE AND CODE KEY PLUG RECEIVING JACKS, ALL OF SAID JACKS BEING CONNECTED IN PARALLEL CIRCUIT RELATIONSHIP WITH SAID VARIABLE TONE INFLUENCING ASSEMBLIES, SAID VARIABLE TONE INFLUENCING ASSEMBLY COMPRISING A PLURALITY OF SWITCH ELEMENTS ACTING IN CONJUNCTION WITH SAID CORE OF SAID SPEAKER AND A HOUSING COMPLETELY ENCLOSING SAID SPEAKER AND SAID VARIABLE TONE INFLUENCING ASSEMBLY. 